Line Follower Robot
An autonomous robot that tracks a taped line using an infrared sensor array and proportional steering correction.
- Suitable for
- School
- Technology
- Arduino Nano
Intermediate5–6 days
Robotics · Controlled Robots
Bluetooth Controlled Robot
A robot driven from an Android phone over Bluetooth, with speed control and an automatic stop on signal loss.
- Difficulty
- Beginner
- Typical time
- 4–5 days
- Suitable for
- School
Price
Contact for price
Cost depends on components, complexity and which deliverables you need, so we quote after understanding your requirement.
Technologies
- Arduino Uno
- HC-05 Bluetooth
- L298N motor driver
- PWM speed control
Project overview
An HC-05 module receives single-character commands from a standard Android controller app and the Arduino translates them into motor directions. Forward, reverse, left, right, stop and a set of speed levels cover everything a demonstration needs.
The feature worth building in is the failsafe. If no command arrives within a short timeout the robot stops by itself, so walking out of range leaves it stationary rather than driving into a wall. Examiners ask what happens when the link drops, and having a real answer is better than an apology.
A gesture-controlled variant replaces the phone with an accelerometer worn on the hand, sending the same command set over a wireless link — the robot itself is unchanged, which makes the two versions a nice comparison to discuss.
Features
- Directional control from a standard Android controller app
- Multiple speed levels via PWM
- Automatic stop if no command is received within the timeout
- Documented command set so you can explain the protocol
- Gesture-controlled variant available on the same chassis
How it works
- 1The HC-05 pairs with the phone and appears as a serial link to the Arduino.
- 2The app sends a single character for each control action.
- 3The sketch reads the character and sets the motor driver inputs for that direction.
- 4Speed characters change the PWM duty cycle applied to the driver's enable pins.
- 5A watchdog timer stops the motors if no character arrives before the timeout expires.
Components used
- Arduino Uno
- HC-05 Bluetooth module
- L298N dual motor driver
- Four geared motors with wheels
- Robot chassis
- Li-ion battery pack
Questions about this project
Which app controls it?
Any standard Bluetooth serial controller app for Android works, since the robot accepts plain characters. The command set is documented so you can use or build any app you prefer.
What is the range?
Around 10 metres indoors with clear line of sight, which is well beyond what a classroom demonstration needs. Beyond that the failsafe stops the robot.
Similar work
Similar projects
Related builds that use the same technologies or suit the same students.
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- Suitable for
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- Technology
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Need the Bluetooth Controlled Robot in Surat?
Send your class or course and your submission date and we'll confirm what's achievable, what it includes and what it costs — before you commit.